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Tetraphenyldithiodiphosphonate is synthesized by polymerization precipitation. The P = S bond of the material has strong polarity, which is conducive to improving the electron mobility of the complex and inhibiting the accumulation between molecules. The synthesized tetraphenyldithiodiphosphonate is characterized by FT-IR, SEM, XPS and XRD. In addition, the pseudo-second-order kinetic model is used to simulate the experimental data well, and the adsorption process conforms to the Langmuir isotherm model. Thermodynamic studies of adsorption have shown that the adsorption process is essentially a spontaneous endothermic process. At room temperature, tetraphenyldithiodiphosphonate demonstrates a maximum adsorption capacity for uranium(VI) reaching 398.8 mg g−1. [ABSTRACT FROM AUTHOR]

In this study, Polyethyleneimine modified magnetic chitosan (MCS-PEI) was synthesized by grafting polyethyleneimine onto chitosan and adding magnetic Fe3O4 with sodium polyphosphate as crosslinking agent. The structure of the prepared material was characterized by FT-IR, SEM, EDS, XRD and XPS, which showed MCS-PEI was successfully synthesized. After a series of single factor experiments, the adsorption data fitted well with the Langmuir model (R2 = 0.99), being the maximum adsorption capacity equal 181.8 mg g−1. The pseudo-second-order model (R2 = 0.997) and Dubinin-Radushkevich model (R2 = 0.9598) indicated that the adsorption process was chemical adsorption. And thermodynamic studies showed that the adsorption was spontaneous and exothermic. The adsorption rate decreased by no more than 4% after the four adsorption–desorption experiments. This work illustrates that MCS-PEI is an environmental friendly, efficient and low-cost adsorbent. [ABSTRACT FROM AUTHOR]

In this work, a new material containing chitosan(CS)-hexachlorocyclotriphosphazene (HP) composite was synthesized with polyphosphoric acid as the cross-linking agent for the effective removal of uranium(VI) from aqueous solution. The prepared material was characterized by FTIR, EDS, SEM, BET and XPS. According to batch experiments, its adsorption equilibrium (Qe = 398.8 mg g−1) was reached within 50 min at pH 6.0. The adsorption process could be well fitted to the pseudo-second-order model and the Langmuir model. The thermodynamic analysis indicated that the adsorption was an exothermic and spontaneous process. Furthermore, the CS-HP has superior absorption reusability. This study proved that CS-HP could be considered as the highly efficient and sustainable material for removal of uranium(VI) from aqueous solution. [ABSTRACT FROM AUTHOR]